// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2014 Benoit Steiner <benoit.steiner.goog@gmail.com>
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.

#include "main.h"
#include <Eigen/CXX11/Tensor>
#include <sstream>
#include <string>

template<int DataLayout>
static void
test_output_0d()
{
	Tensor<int, 0, DataLayout> tensor;
	tensor() = 123;

	std::stringstream os;
	os << tensor;

	std::string expected("123");
	VERIFY_IS_EQUAL(std::string(os.str()), expected);
}

template<int DataLayout>
static void
test_output_1d()
{
	Tensor<int, 1, DataLayout> tensor(5);
	for (int i = 0; i < 5; ++i) {
		tensor(i) = i;
	}

	std::stringstream os;
	os << tensor;

	std::string expected("0\n1\n2\n3\n4");
	VERIFY_IS_EQUAL(std::string(os.str()), expected);

	Eigen::Tensor<double, 1, DataLayout> empty_tensor(0);
	std::stringstream empty_os;
	empty_os << empty_tensor;
	std::string empty_string;
	VERIFY_IS_EQUAL(std::string(empty_os.str()), empty_string);
}

template<int DataLayout>
static void
test_output_2d()
{
	Tensor<int, 2, DataLayout> tensor(5, 3);
	for (int i = 0; i < 5; ++i) {
		for (int j = 0; j < 3; ++j) {
			tensor(i, j) = i * j;
		}
	}

	std::stringstream os;
	os << tensor;

	std::string expected("0  0  0\n0  1  2\n0  2  4\n0  3  6\n0  4  8");
	VERIFY_IS_EQUAL(std::string(os.str()), expected);
}

template<int DataLayout>
static void
test_output_expr()
{
	Tensor<int, 1, DataLayout> tensor1(5);
	Tensor<int, 1, DataLayout> tensor2(5);
	for (int i = 0; i < 5; ++i) {
		tensor1(i) = i;
		tensor2(i) = 7;
	}

	std::stringstream os;
	os << tensor1 + tensor2;

	std::string expected(" 7\n 8\n 9\n10\n11");
	VERIFY_IS_EQUAL(std::string(os.str()), expected);
}

template<int DataLayout>
static void
test_output_string()
{
	Tensor<std::string, 2, DataLayout> tensor(5, 3);
	tensor.setConstant(std::string("foo"));

	std::cout << tensor << std::endl;

	std::stringstream os;
	os << tensor;

	std::string expected("foo  foo  foo\nfoo  foo  foo\nfoo  foo  foo\nfoo  foo  foo\nfoo  foo  foo");
	VERIFY_IS_EQUAL(std::string(os.str()), expected);
}

template<int DataLayout>
static void
test_output_const()
{
	Tensor<int, 1, DataLayout> tensor(5);
	for (int i = 0; i < 5; ++i) {
		tensor(i) = i;
	}

	TensorMap<Tensor<const int, 1, DataLayout>> tensor_map(tensor.data(), 5);

	std::stringstream os;
	os << tensor_map;

	std::string expected("0\n1\n2\n3\n4");
	VERIFY_IS_EQUAL(std::string(os.str()), expected);
}

EIGEN_DECLARE_TEST(cxx11_tensor_io)
{
	CALL_SUBTEST(test_output_0d<ColMajor>());
	CALL_SUBTEST(test_output_0d<RowMajor>());
	CALL_SUBTEST(test_output_1d<ColMajor>());
	CALL_SUBTEST(test_output_1d<RowMajor>());
	CALL_SUBTEST(test_output_2d<ColMajor>());
	CALL_SUBTEST(test_output_2d<RowMajor>());
	CALL_SUBTEST(test_output_expr<ColMajor>());
	CALL_SUBTEST(test_output_expr<RowMajor>());
	CALL_SUBTEST(test_output_string<ColMajor>());
	CALL_SUBTEST(test_output_string<RowMajor>());
	CALL_SUBTEST(test_output_const<ColMajor>());
	CALL_SUBTEST(test_output_const<RowMajor>());
}
